public class Test01 {
    public static void main(String[] args) {
        //算术运算符
  
        int a=10;
        int b=3;
        System.out.println(a+b);
        System.out.println(10+3);
        System.out.println("10"+"3");
        int c=10;
        c++;
        int d;
        int e;
        System.out.println(c);
        c=10;
        d=c++;//xian fu zhi ,zai zi zeng
        System.out.println(c);
        System.out.println(d);
        c=10;
        e=++c;//xian zi zeng ,zai fu zhi
        System.out.println(e);


        int x=4;
        int y;
        y=(x--)+(--x)+(x*10);
        System.out.println("x="+x);
        System.out.println("y="+y);

        String s1=5<1?"表达式成立":"表达式不成立";
        System.out.println(s1);
    }
}
